Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python

Posted by Mathew Yangang
Mathew Yangang
4,433 Points

expected output

I am getting, "didn't get the expected output", not sure where the error is

instances.py 
def combiner(lst):
    x = ""
    j=0
    for item in lst:
        if  isinstance(str,str) and isinstance(float,int):
            x.append(lst[item])
            j+=j
    return x + str(j)

1 Answer

ursaminor
ursaminor
11,271 Points

There are a number of errors.

  • You can't append() to a string. You use + to add to a string.
  • isinstance syntax is wrong. Remember you need to check item.
  • something can't be a string and a number. You need to check for two conditions -- if it's a string, do this, if it's a number, do that.
  • you need to increment j by item (if it's a number), not by itself, which is 0